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RECEIVABLES, CONTRACT ASSETS, AND DEFERRED REVENUE - Summary of Unbilled Receivables (Details)
$ in Thousands
Jun. 30, 2021
USD ($)
Receivables [Abstract]  
1 year or less $ 236,451
1-2 years 88,350
2-5 years 55,715
Total $ 380,516
Percentage of unbilled receivables, 1 year or less 62.00%
Percentage of unbilled receivables, 1-2 years 23.00%
Percentage of unbilled receivables, 2-5 years 15.00%
Total percentage of unbilled receivables 100.00%